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CAMBRIA SEP 032002 <br /> ENENT HEALTH <br /> pERMIMSERVICES <br /> August 30, 2002 <br /> Mr Harlin Knoll <br /> San Joaquin County Environmental Health Department <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> Re Groundwater Monitoring Report— Second Quarter 2002 <br /> Shell-branded Service Station <br /> 3725 Tracy Boulevard <br /> Tracy, California <br /> SAP Code 136186 <br /> Incident No 98996222 <br /> Dear Mr Knoll <br /> Cambria Environmental Technology, Inc (Cambria) prepared this report on behalf of Equilon <br /> Enterprises LLC dba Shell Oil Products US (Shell) in accordance with quarterly reporting <br /> requirements of 23 CCR 2652d <br /> SECOND QUARTER 2002 ACTIVITIES <br /> Groundwater Monitoring. Blaine Tech Services, Inc (Blaine) of San Jose, California gauged <br /> and sampled all site wells and prepared a summary table of field gauging data and laboratory <br /> analytical results These activities were coordinated with the Chevron service station located at <br /> 3775 Tracy Boulevard Cambria prepared a site vicinity/well survey map (Figure 1), and a <br /> groundwater contour/chemical concentration map (Figure 2) Cambria also prepared a graph <br /> (Figure 3) which is a plot of MTBE concentration in monitoring well MW-1A versus time <br /> Cumulative mass removed is also shown on the graph Blaine's report, which includes the <br /> laboratory report, is included as Appendix A Available well gauging data for the Chevron <br /> station is included in Appendix B <br /> Groundwater Remediation Monthly groundwater extraction (GWE) using a vacuum truck <br /> Oakland [A began February 7, 2000 During May 2001 the frequency of GWE was increased to twice a <br /> San Ramon CA month Between April 3, 2002 and June 24, 2002, a total of 18,111 gallons of groundwater was <br /> Sonoma CA removed from well MW-1A A summary of the volume of groundwater extracted at the site and <br /> Cambria an estimate of the amount of total purgeable hydrocarbons as gasoline (TPHg), benzene, and <br /> Environmental methyl tertiary butyl ether (MTBE)removed is presented in Table 1 <br /> Technology, Inc <br />_18erkins Street <br /> PO Box 259 <br /> Sonoma CA 95476 <br /> Tel(707)935-4850 <br /> Fax(707)935-6649 <br />